I haven't seen any complaints of poor workmanship. The 2 complaints in the following articles are one on a larger, more radical engine. And one that was actually about a much older and different Demon.

There is a lot more on Google about these carbs.

http://www.hotrod.com/how-to/engine/inside-the-new-street-demon-750-cfm-carburetor/

http://www.dodgecharger.com/forum/index.php?topic=112118.0

http://www.forabodiesonly.com/mopar/archive/index.php/t-241659.html